Externally activated mounting bracket



FIG. 1 is a front three-quarter perspective view embodying my new design;

FIG. 2 is a front plan view;

FIG. 3 is a side plan view taken from the right;

FIG. 4 is a rear plan view;

FIG. 5 is a side plan view taken from the left; and,

FIG. 6 is a top plan view.

The broken lines in the drawings depict unclaimed environmental subject matter. 

The ornamental design for an externally activated mounting bracket, as shown and described. 